Abstract # 13422 Event # 33:

Scheduled for Thursday, August 22, 2019 10:45 AM-11:00 AM: (Room 326) Oral Presentation


A. Di Fiore1,2, L. A. Abondano1,2, K. M. Ellis1,2,3, P. B. Chaves4, A. Link2,6 and K. B. Strier5
1University of Texas at Austin, Department of Anthropology, 2201 Speedway Stop C3200, Austin, Texas 78712, USA, 2Proyecto Primates, 3Miami University, 4New York University, 5University of Wisconsin, Madison, 6Universidad de Los Andes, Bogota, Colombia



Field studies of ateline primates (woolly monkeys, spider monkeys, and muriquis) suggest that male social relationships are not characterized by clear dominance hierarchies and often involve minimal overt competition over mating. Indeed, males within groups tend to be extremely tolerant or even affiliative and to manifest cooperative behavior in particular contexts (e.g., intergroup encounters), a phenomenon attributed to male philopatry and concomitantly high male relatedness. At the same time, female atelines commonly mate with multiple males within and across reproductive cycles.  Using behavioral data and PCR-based multilocus genotypes for 70+ individuals per taxon, we evaluated mating and reproductive skew among males in 2-4 wild groups of each of these atelines (N=23-48 high-confidence paternity assignments per taxon). For muriquis and spider monkeys, paternity skew measured across birth cohorts was low (Nonac's B<0.1), consistent with observations of polyandrous mating by females and limited male mating skew. Still, paternity within some cohorts was concentrated in a small number of sires, though the set of males differed between cohorts. By contrast, in spite of generally egalitarian mating, woolly monkey paternities were skewed towards males with more developed secondary sexual characteristics (permutation tests, p<0.05). Our results support past behavioral data indicating a strong role of female choice, as well as possible indirect male mating competition (e.g., sperm competition), in shaping patterns of male reproductive success.